131 lines
4.4 KiB
Plaintext
131 lines
4.4 KiB
Plaintext
[Ivm nuui
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. mum and [rims Fm ponds, ilie iypes of waier
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Im| eonnuls ama ei-irieal fadnr Mndtm pnadiieiiun al
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ielialale and flmble pipe iias made very simple level
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(0mm! posslhle, eiiliei as an elbow or iipiurned lie-rials
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we
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Outlets ran also be a hanrfl syslnmi as basxels inru
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whidl waier lalls, ur as smallevr ponds wiili sereaned
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spillways inai gitlvu fish mlgrilmg duwnslmam liuili
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ais used In gafllzr ads “I |m| lnnn sampler swamp
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sysienisdillienll ln liarvesi by neis.
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lnlelsareliliewise regulaled and screened, laui pieuier
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alleniipn inusl be paid la prevenl ilie cmry or sill,
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wzeds, or unwanisd organisms iuip inn pund ilsell.
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Cpriseqiienlly, inlels can lie (ample): sysieins ul lilleis
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and semens wliere waiurduaiiiy is pour, or very simple
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pipes wlieie iinppllured and lisleliee waler is drawn
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* si sysleius am piynn in Figure
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CAGE CULTURE
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Cages at Wood. woven naiural malerials, ineial inesli
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land nawadays modern synrlieue meshes) have bean
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used since lnuqmly m lrap ur liaryesi uslii, and an. in
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eurrsrii widespread use lur inlensiic [Hi rearing in
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bum slrll and llpwing waieis ages can be used to
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piuleel eggs and lry, and speeias siieli as snirpedn are
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naiclisd in cages {Fig-u! 1131A) Live lisli, crnylisli,
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prawns, mulluses, and ze|s haw been iradiiinnnlly liuld
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in eapes pr ran/s lpionpuneed sprlsl, Ilpaiing barges.
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and wel wells in boa-s rnr me liesli sh markei new
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are Aka used in liuld eels, Wsms, crayfish, eaip. and
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weed or algae ealivis in nduee algal iainis in liali nesli
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[figure 1331.0,
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wnem flow is r:pxd,(ag¢ mesli large, or wnvr muluin
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exisis, oxygenalmn in rages is nu preal prubhm There
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is wmeadvdmagz. npweyer, in snaping cagessnblea |u
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rapid lidal llaw. or iu IndflCL‘ waior eireiiLinon in me
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(332. as in rim... mu
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Normally, however, (ages are circular, as in salrripn
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Hug-Ml nilnire. or plain squaie in sun slaiied wood
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tansmtlwn Wig"): mml Typical Nanny, (ash in
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which lisri am led, and which float in larger bad a!
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waier, have a wee flow mainlained by H": swimming
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atlmn 0! me fish ilieinselyes Such cagks produre llie
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laigesi yields knnwn ipaaiiaeulniis
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Mucnng rapas an be ellaeled by indiyidnal anchors,
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as sels alas“ aiiaened to flaming dub ur walkways,
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m as gangs iil rages laskvlzd in lines, and (dllowmg a
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buahwxdlh helween saga pal .l, llis- gangs ean be
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)iwldwd new bay or anemiied in flunklmfi in own
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waler ripi supieei [0 “Glen! wavv aclipn (£15m:
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mm old WM serve well as spdcers bflwm'n rage
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unis l used eauls fur yaais m shellered bay; in linld
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slielllisli and n¢| “Sh lur niarlrei, and mu'lv sullseed
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lnsses. laui nll rages need an annual inspeeliun and
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witchlul mainisnaneu. piedaiuis siieli as odoprus and
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ssnls ean rause large murlalilies in sags hali, wlicreas
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pnrid lisii mu aynid sueli 105565 km eyasipn on raw
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uerasiuns, large shark aliasx ragsd lisli and deslruy
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sages, a luss nul erperipnrad in pom! eiiliuiesl
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NUTRITION AXD mop sum-ix
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rlie sinis cans musi be paid (0 ilie nulnhun ol iisn and
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slielllisn as in iliaipl land species Wlamln supply '1“!!!
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liesli greens, lriiiis, and algae are esssniuil.
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Hipnaprniein lunds, Win a rriridesl admlxhlk pl
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slak‘hy loads land all eil inese in lrssli mndlhml! is a
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fl‘quxsuk‘ lur lienllny gmwlh, as lernliser is in. planis
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rnera is no subsiiinie lar lresli liye lmd la produce
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hlgh uualily lisn slime slralugies [m seller lisli
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nulnhon am given neie, (he) nie lhl' erilieal simlesies
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lurciisi sau gs lur waxy reinseriaiuin)
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Fish mainlain prnwln by inning abum l-x nl llieir
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badlkwugm d. y, nnd gem mosl weipni (a! ilii leasl
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msle nl imidl ulieu led ai m a! bad -wmghl daily
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Agaln, iriils ul leedin; aie needid lur spenlie species
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and size gNups. in. s n good rule ril \humlv lu fad
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inn .is met. [and as will laa rumplerely eau-n in is
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minuies, in check on [AM wasied, and in usiabllsli a
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gnmlh .unie lniin samples hkn as Iho lisn grow
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Demand leedinp, win-re lht‘ lush inemselues nigger a
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ludd supply wlien hungjv has ils adi-aniages. b'ul niay
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nueessilaie pelleied load: piirrnassd ni mn’w dung. ul
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uiral expense Suhrsamples air neiied lisn ean be
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weighed and .i wélghed ram)" Md .1! m o( lpial,
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allowing a mm. mnmlny in lingerlinps, .ind 40-605!
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in lry
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|| snpiild bu nhv ous |ha| wnaieyer [mud we enn sniw
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in mlleel as 'waaks is a critical [dam in energy and
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mi ennseryaupn. Fm some 0! ”less slralagiis ws inusl
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look in syslein. wllhln m boundaries m the pund
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mun: u an
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mm small:
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in llmnlol have; unmniemniinil m lunpal pullulanir
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490
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